Apparatuses and methods for memory device as a store for block program instructions

ABSTRACT

The apparatuses and methods related to a memory device as the store to program instructions. An example apparatus comprises a memory device having an array of memory cells and sensing circuitry coupled to the array. The sensing circuitry includes a sense amplifier and a compute component configured to implement logical operations. A memory controller, coupled to the array and the sensing circuitry is configured to receive a block of instructions including a plurality of program instructions. The memory controller is configured to store the block of instructions in the array and retrieve program instructions to perform logical operations on the compute component.

PRIORITY INFORMATION

This application is a Continuation of U.S. patent application Ser. No. 15/669,590, which is a Continuation of International Application Number PCT/US2016/015059, filed Jan. 27, 2016, which claims the benefit to U.S. Provisional Application 62/112,914, filed Feb. 6, 2015, the entire contents of which are incorporated herein by reference in its entirety.

TECHNICAL FIELD

The present disclosure relates generally to semiconductor memory and methods, and more particularly, to apparatuses and methods for memory device as a store for program instructions.

BACKGROUND

Memory devices are typically provided as internal, semiconductor, integrated circuits in computing systems. There are many different types of memory including volatile and non-volatile memory. Volatile memory can require power to maintain its data (e.g., host data, error data, etc.) and includes random access memory (RAM), dynamic random access memory (DRAM), static random access memory (SRAM), synchronous dynamic random access memory (SDRAM), and thyristor random access memory (TRAM), among others. Non-volatile memory can provide persistent data by retaining stored data when not powered and can include NAND flash memory, NOR flash memory, and resistance variable memory such as phase change random access memory (PCRAM), resistive random access memory (RRAM), and magnetoresistive random access memory (MRAM), such as spin torque transfer random access memory (STT RAM), among others.

Computing systems often include a number of processing resources (e.g., one or more processors), which may retrieve and execute instructions and store the results of the executed instructions to a suitable location. A processor can comprise a number of functional units such as arithmetic logic unit (ALU) circuitry, floating point unit (FPU) circuitry, and/or a combinatorial logic block, for example, which can be used to execute instructions by performing logical operations such as AND, OR, NOT, NAND, NOR, and XOR, and invert (e.g., inversion) logical operations on data (e.g., one or more operands). For example, functional unit circuitry may be used to perform arithmetic operations such as addition, subtraction, multiplication, and/or division on operands via a number of logical operations.

A number of components in a computing system may be involved in providing instructions to the functional unit circuitry for execution. The instructions may be executed, for instance, by a processing resource such as a controller and/or host processor. Data (e.g., the operands on which the instructions will be executed) may be stored in a memory array that is accessible by the functional unit circuitry. The instructions and/or data may be retrieved from the memory array and sequenced and/or buffered before the functional unit circuitry begins to execute instructions on the data. Furthermore, as different types of operations may be executed in one or multiple clock cycles through the functional unit circuitry, intermediate results of the instructions and/or data may also be sequenced and/or buffered.

In many instances, the processing resources (e.g., processor and/or associated functional unit circuitry may be external to the memory array, and data is accessed via a bus between the processing resources and the memory array to execute a set of instructions. Processing performance may be improved in a processor-in-memory device, in which a processing resource may be implemented internal and/or near to a memory (e.g., directly on a same chip as the memory array). A processing-in-memory device may save time by reducing and/or eliminating external communications and may also conserve power.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1A is a block diagram of an apparatus in the form of a computing system including a memory device in accordance with a number of embodiments of the present disclosure.

FIG. 1B is another block diagram of an apparatus in the form of a computing system including a memory device in accordance with a number of embodiments of the present disclosure.

FIG. 1C is a block diagram of a bank to a memory device in accordance with a number of embodiments of the present disclosure.

FIG. 1D is another block diagram of a bank to a memory device in accordance with a number of embodiments of the present disclosure.

FIG. 2 is a schematic diagram illustrating sensing circuitry to a memory device in accordance with a number of embodiments of the present disclosure.

FIG. 3 is a schematic diagram illustrating sensing circuitry to a memory device in accordance with a number of embodiments of the present disclosure.

FIG. 4 is a logic table illustrating selectable logic operation results implemented by a sensing circuitry shown in FIG. 3 in accordance with a number of embodiments of the present disclosure.

DETAILED DESCRIPTION

The present disclosure includes apparatuses and methods related to having a memory device as a store to program instructions, e.g., for processing-in-memory (PIM) commands to PIM capable devices. In one embodiment, the apparatus comprises a memory device. The apparatus may be coupled to a host via a data bus and a control bus. The memory device includes an array of memory cells and sensing circuitry coupled to the array via a plurality of sense lines. The sensing circuitry includes a sense amplifier and a compute component configured to implement logical operations.

A memory controller is coupled to the array and sensing circuitry. The memory controller is configured to receive a block of instructions having a plurality of program instructions. For example, the block of instructions may be received from a host. In various embodiments, the program instructions are pre-resolved by a host. As used herein, the term “pre-resolved” is intended to mean the program instructions are designed, e.g. written by a programmer, in software and/or firmware, e.g., machine instructions (also referred to as “microcode”) for a particular device, e.g., PIM capable device. Additionally, as used herein the term “pre-resolved” is intended to indicate that address translations for storing the instructions have been determined, e.g., by a host processing resource.

In various embodiments, the block of instructions includes a plurality of instructions associated with processing-in-memory (PIM) commands (also referred to herein as “program instructions”). As used herein, PIM commands are executed to cause a PIM capable device to perform logical operations on or near memory. Examples of logical operations include logical Boolean operations such as AND, NOR, XOR, etc. The memory controller is configured to store the block of instructions in the array and retrieve program instructions to perform logical operations on the compute component.

As will be explained in greater detail below a bank to memory device may be sixteen thousand, or more (16K+), columns wide. There may be a plurality of bank sections to the bank within an array. Each bank section may have a particular number of rows, e.g., 512 rows. A plurality of blocks may be defined across a 16K+ column wide bank section. A block in the bank section may have a 1K+ column width. Hence a block of instructions, as used herein, is intended to mean a block of instructions having a bit length of approximately 1K bits as suited to storage in a PIM capable device. In various embodiments, blocks may include further definition into a plurality of chunks, e.g. four (4) 256 bit chunks. Embodiments, however, are not limited to this example number of bits.

As will be evident further below in this disclosure, such granular definition may be useful to a processing-in-memory (PIM) capable memory device in which vectors need to be aligned to perform logical operations. For example, a 256 bit chuck can be treated as a vector of four (4) 64 bit values, e.g., numerical values. Each 64 bit value can be an element to a vector in a logical operation. Additionally, a block of instructions having a plurality of instructions associated with PIM commands may include 64 bit PIM commands. For example, individual PIM commands (e.g., “program instructions”) to perform logic operations may be 64 bits in length. Thus, the PIM commands may be in the form of microcoded instructions that are 64 bits in length.

Further it is noted that PIM capable device operations may use bit vector based operations to perform logical operations. As used herein, the term “bit vector” is intended to mean a physically contiguous number of bits on a bit vector memory device, e.g., PIM device, whether physically contiguous in rows (e.g., horizontally oriented) or columns (e.g., vertically oriented) in an array of memory cells. Thus, as used herein a “bit vector operation” is intended to mean an operation that is performed on a bit-vector that is a contiguous portion (also referred to as “chunk”) of virtual address space, e.g., used by a PIM device. For example, a chunk of virtual address space may have a bit length of 256 bits. A chunk may or may not be contiguous physically to other chunks in the virtual address space.

An important feature for any processing resource is the ability to access enough program instructions to stay busy with minimal delay or interruption. Until the present disclosure, a processing-in-memory (PIM) device looked to augment the dynamic random access memory (DRAM) address/control bus to pass PIM commands to the memory controllers for each bank on a DRAM device. For that scheme, each bank in the DRAM would then provide a small memory dedicated to instructions. The design complications from this approach are twofold.

First, the need to make the address/control (A/C) bus larger and operate at higher speed adds significant risk to the input/output (I/O) design of the DRAM part. Increasing the quantity and speed of the I/O significantly affects the chip area and involves careful design work to avoid interference with the actual DRAM operation.

Second, the usable instruction bandwidth on the chip would be limited significantly by the small size of the instruction memory included in each bank. The limited size of that instruction memory without a “backing store”, e.g., storage local to the bank, means that once the instruction stream runs beyond the sized of that small memory, the DRAM would be waiting for the host system to provide the next set of instructions. Increasing the size of the dedicated instruction memory (e.g., “cache” local to the bank) would improve the ability of the PIM system to provide enough instructions to keep the DRAM busy with PIM operations. However, increasing the amount of memory affects the overall chip area and also increases the possibility of interference with the actual DRAM operation.

Embodiments of the present disclosure provide an efficient method of providing a large number of program instructions, with arguments, to the DRAM and then route those instructions to an embedded processing engine, e.g., memory controller, of the DRAM with low latency, while preserving the protocol, logical, and electrical interfaces for the DRAM. Hence, embodiments described herein may facilitate keeping the A/C bus at a standard width and data rate, reducing any amount of “special” design for the PIM DRAM and also making the PIM DRAM more compatible with existing memory interfaces in a variety of computing devices.

Additionally, the embodiments described herein may allow the host system to provide a large block of instructions to the DRAM at the beginning of an operation, significantly reducing, or completely eliminating, the interruptions in instruction execution to transfer more instructions to a PIM capable DRAM device. Previous compromises in the PIM capable device design and control flow for the embedded processing engine, e.g., memory controller, with DRAM included significant increases in the I/O used on the DRAM which would increase the fraction of non-productive space on the part, and increase the floor planning and noise containment complications, and increase the power dissipation on the part without adding additional computing performance. Also as noted above, other previous compromises included using relatively large, special purpose memory regions in the DRAM to store program instructions while still not being large enough to hold large amounts of program instructions, thus increasing contention for the I/O resources on the overall chip and decreasing the effective speed of the memory controller.

As described in more detail below, the embodiments can allow a host system to allocate a number of locations, e.g., sub-arrays (or “subarrays”) or portions of subarrays in a plurality of DRAM banks to hold blocks of instructions. The host system would perform the address resolution on an entire block of instructions and write them into the allocated locations, e.g., subarrays, with a target bank. According to various embodiments, the blocks of instructions can include one or more distinct instructions associated with processing in memory (PIM) commands (also referred to herein as “program instructions”). As used herein, PIM commands are executed to cause a PIM capable device to perform logical operations on or near memory. For example, in various embodiments, the logical operations may be performed on pitch with a memory array of the PIM capable device.

Writing the blocks of instructions to the allocated locations utilizes the normal DRAM write path to the DRAM device. After the blocks of instructions are written into the allocated locations, e.g., subarrays, the host system can direct a memory controller, e.g., DRAM bank controller, to start execution of the block of instructions. The memory controller will pull blocks of instructions from the allocated locations as necessary to handle the branches, loops, logical and data operations contained with the block of instructions, caching the program instructions and refilling an instruction cache as necessary.

Further, while the memory controller is executing a block of instructions, the host system can be writing, e.g., pre-writing, a subsequent block of instruction into the allocated instruction subarrays to facilitate the start of future calculations in the PIM capable device. As the reader will appreciate, while a DRAM style PIM capable device is discussed with examples herein, embodiments are not limited to a DRAM processor-in-memory (PIM) implementation (PIMRAM).

In order to appreciate the improved program instruction techniques an apparatus for implementing such techniques, a discussion of a memory device having PIM capabilities, and associated host, follows. According to various embodiments, program instructions, e.g., PIM commands, involving a memory device having PIM capabilities can distribute implementation of the PIM commands over multiple sensing circuitries that can implement logical operations and can store the PIM commands within the memory array, e.g., without having to transfer them back and forth with a host over an A/C bus for the memory device. Thus, PIM commands involving a memory device having PIM capabilities can be completed in less time and using less power. Some time and power advantage can be realized by reducing the amount of data that is moved around a computing system to process the requested memory array operations (e.g., reads, writes, etc.).

A number of embodiments of the present disclosure can provide improved parallelism and/or reduced power consumption in association with performing compute functions as compared to previous systems such as previous PIM systems and systems having an external processor (e.g., a processing resource located external from a memory array, such as on a separate integrated circuit chip). For instance, a number of embodiments can provide for performing fully complete compute functions such as integer add, subtract, multiply, divide, and CAM (content addressable memory) functions without transferring data out of the memory array and sensing circuitry via a bus (e.g., data bus, address bus, control bus), for instance. Such compute functions can involve performing a number of logical operations (e.g., logical functions such as AND, OR, NOT, NOR, NAND, XOR, etc.). However, embodiments are not limited to these examples. For instance, performing logical operations can include performing a number of non-Boolean logic operations such as copy, compare, destroy, etc.

In previous approaches, data may be transferred from the array and sensing circuitry (e.g., via a bus comprising input/output (I/O) lines) to a processing resource such as a processor, microprocessor, and/or compute engine, which may comprise ALU circuitry and/or other functional unit circuitry configured to perform the appropriate logical operations. However, transferring data from a memory array and sensing circuitry to such processing resource(s) can involve significant power consumption. Even if the processing resource is located on a same chip as the memory array, significant power can be consumed in moving data out of the array to the compute circuitry, which can involve performing a sense line (which may be referred to herein as a digit line or data line) address access (e.g., firing of a column decode signal) in order to transfer data from sense lines onto I/O lines (e.g., local I/O lines), moving the data to the array periphery, and providing the data to the compute function.

Furthermore, the circuitry of the processing resource(s) (e.g., compute engine) may not conform to pitch rules associated with a memory array. For example, the cells of a memory array may have a 4F² or 6F² cell size, where “F” is a feature size corresponding to the cells. As such, the devices (e.g., logic gates) associated with ALU circuitry of previous PIM systems may not be capable of being formed on pitch with the memory cells, which can affect chip size and/or memory density, for example. A number of embodiments of the present disclosure include sensing circuitry formed on pitch with an array of memory cells and capable of performing compute functions such as gather and scatter operations local to the array of memory cells.

In the following detailed description of the present disclosure, reference is made to the accompanying drawings that form a part hereof, and in which is shown by way of illustration how one or more embodiments of the disclosure may be practiced. These embodiments are described in sufficient detail to enable those of ordinary skill in the art to practice the embodiments of this disclosure, and it is to be understood that other embodiments may be utilized and that process, electrical, and/or structural changes may be made without departing from the scope of the present disclosure. As used herein, designators such as “N”, “M”, etc., particularly with respect to reference numerals in the drawings, indicate that a number of the particular feature so designated can be included. As used herein, “a number of” a particular thing can refer to one or more of such things (e.g., a number of memory arrays can refer to one or more memory arrays). A “plurality of” is intended to refer to more than one of such things.

The figures herein follow a numbering convention in which the first digit or digits correspond to the drawing figure number and the remaining digits identify an element or component in the drawing. Similar elements or components between different figures may be identified by the use of similar digits. For example, 206 may reference element “06” in FIG. 2, and a similar element may be referenced as 306 in FIG. 3. As will be appreciated, elements shown in the various embodiments herein can be added, exchanged, and/or eliminated so as to provide a number of additional embodiments of the present disclosure. In addition, as will be appreciated, the proportion and the relative scale of the elements provided in the figures are intended to illustrate certain embodiments of the present invention, and should not be taken in a limiting sense.

FIG. 1A is a block diagram of an apparatus in the form of a computing system 100 including a memory device 120 in accordance with a number of embodiments of the present disclosure. As used herein an apparatus is intended to mean one or more components, devices and/or systems which may be coupled to achieve a particular function. A system, as used herein, is intended to mean a collection of devices coupled together, whether in wired or wireless fashion, to form a larger network, e.g., as in a distributed computing network. Hence, the memory device 120, memory controller 140, channel controller 143, bank arbiter 145, high speed interface (HSI) 141, memory array 130, sensing circuitry 150, and/or logic circuitry 170, shown and discussed in FIGS. 1A-1D, might also be separately considered an “apparatus.”

System 100 includes a host 110 coupled (e.g., connected) to memory device 120, which includes a memory array 130. Host 110 can be a host system such as a personal laptop computer, a desktop computer, a digital camera, a smart phone, or a memory card reader, among various other types of hosts. Host 110 can include a system motherboard and/or backplane and can include a number of processing resources (e.g., one or more processors, microprocessors, or some other type of controlling circuitry). The system 100 can include separate integrated circuits or both the host 110 and the memory device 120 can be on the same integrated circuit. The system 100 can be, for instance, a server system and/or a high performance computing (HPC) system and/or a portion thereof. Although the example shown in FIGS. 1A and 1B illustrates a system having a Von Neumann architecture, embodiments of the present disclosure can be implemented in non-Von Neumann architectures, which may not include one or more components (e.g., CPU, ALU, etc.) often associated with a Von Neumann architecture.

For clarity, the system 100 has been simplified to focus on features with particular relevance to the present disclosure. The memory array 130 can be a DRAM array, SRAM array, STT RAM array, PCRAM array, TRAM array, RRAM array, NAND flash array, and/or NOR flash array, for instance. The array 130 can comprise memory cells arranged in rows coupled by access lines (which may be referred to herein as word lines or select lines) and columns coupled by sense lines, which may be referred to herein as data lines or digit lines. Although a single array 130 is shown in FIG. 1, embodiments are not so limited. For instance, memory device 120 may include a number of arrays 130 (e.g., a number of banks of DRAM cells, NAND flash cells, etc.).

The memory device 120 includes address circuitry 142 to latch address signals provided over a data bus 156 (e.g., an I/O bus) through I/O circuitry 144. Status and/or exception information can be provided from the memory controller 140 on the memory device 120 to a channel controller 143, including an out-of-band bus 157, which in turn can be provided from the memory device 120 to the host 110. Address signals are received through address circuitry 142 and decoded by a row decoder 146 and a column decoder 152 to access the memory array 130. Data can be read from memory array 130 by sensing voltage and/or current changes on the data lines using sensing circuitry 150. The sensing circuitry 150 can read and latch a page (e.g., row) of data from the memory array 130. The I/O circuitry 144 can be used for bi-directional data communication with host 110 over the data bus 156. The write circuitry 148 is used to write data to the memory array 130.

Memory controller 140, e.g., bank control logic and/or sequencer, decodes signals provided by control bus 154 from the host 110. These signals can include chip enable signals, write enable signals, and address latch signals that are used to control operations performed on the memory array 130, including data read, data write, and data erase operations. In various embodiments, the memory controller 140 is responsible for executing instructions from the host 110. The memory controller 140 can include control logic, a sequencer, a state machine or some other type of logic circuitry. The controller 140 can control shifting data (e.g., right or left) in an array, e.g., memory array 130.

Examples of the sensing circuitry 150 are described further below. For instance, in a number of embodiments, the sensing circuitry 150 can comprise a number of sense amplifiers and a number of compute components, which may serve as, and be referred to herein as, an accumulator and can be used to perform logical operations (e.g., on data associated with complementary data lines).

In a number of embodiments, the sensing circuitry 150 can be used to perform logical operations using data stored in array 130 as inputs and store the results of the logical operations back to the array 130 without transferring data via a sense line address access (e.g., without firing a column decode signal). As such, various compute functions can be performed using, and within, sensing circuitry 150 rather than (or in association with) being performed by processing resources external to the sensing circuitry (e.g., by a processor associated with host 110 and/or other processing circuitry, such as ALU circuitry, located on device 120 (e.g., on controller 140 or elsewhere)).

In various previous approaches, data associated with an operand, for instance, would be read from memory via sensing circuitry and provided to external ALU circuitry via I/O lines (e.g., via local I/O lines and/or global I/O lines). The external ALU circuitry could include a number of registers and would perform compute functions using the operands, and the result would be transferred back to the array via the I/O lines. In contrast, in a number of embodiments of the present disclosure, sensing circuitry 150 is configured to perform logical operations on data stored in memory array 130 and store the result back to the memory array 130 without enabling an I/O line (e.g., a local I/O line) coupled to the sensing circuitry 150. The sensing circuitry 150 can be formed on pitch with the memory cells of the array. Additional peripheral sense amplifiers, registers, cache and/or data buffering, e.g., logic circuitry 170, can be coupled to the sensing circuitry 150 and can be used to store, e.g., cache and/or buffer, results of operations described herein.

As such, in a number of embodiments, circuitry external to array 130 and sensing circuitry 150 is not needed to perform compute functions as the sensing circuitry 150 can perform the appropriate logical operations to perform such compute functions without the use of an external processing resource. Therefore, the sensing circuitry 150 may be used to compliment and/or to replace, at least to some extent, such an external processing resource (or at least the bandwidth consumption of such an external processing resource).

However, in a number of embodiments, the sensing circuitry 150 may be used to perform logical operations (e.g., to execute instructions) in addition to logical operations performed by an external processing resource (e.g., host 110). For instance, host 110 and/or sensing circuitry 150 may be limited to performing only certain logical operations and/or a certain number of logical operations.

Enabling an I/O line can include enabling (e.g., turning on) a transistor having a gate coupled to a decode signal (e.g., a column decode signal) and a source/drain coupled to the I/O line. However, embodiments are not limited to not enabling an I/O line. For instance, in a number of embodiments, the sensing circuitry (e.g., 150) can be used to perform logical operations without enabling column decode lines of the array; however, the local I/O line(s) may be enabled in order to transfer a result to a suitable location other than back to the array 130 (e.g., to an external register).

FIG. 1B is a block diagram of another apparatus architecture in the form of a computing system 100 including a plurality of memory devices 120-1, . . . , 120-N coupled to a host 110 via a channel controller 143 in accordance with a number of embodiments of the present disclosure. In at least one embodiment the channel controller 143 may be coupled to the plurality of memory devices 120-1, . . . , 120-N in an integrated manner in the form of a module 118, e.g., formed on same chip with the plurality of memory devices 120-1, . . . , 120-N. In an alternative embodiment, the channel controller 143 may be integrated with the host 110, as illustrated by dashed lines 111, e.g., formed on a separate chip from the plurality of memory devices 120-1, . . . , 120-N. The channel controller 143 can be coupled to each of the plurality of memory devices 120-1, . . . , 120-N via an address and control (A/C) bus 154 as described in FIG. 1A which in turn can be coupled to the host 110. The channel controller 143 can also be coupled to each of the plurality of memory devices, 120-1, . . . , 120-N via a data bus 156 as described in FIG. 1A which in turn can be coupled to the host 110. In addition, the channel controller 143 can be coupled to each of the plurality of memory devices 120-1, . . . , 120-N via an out-of-bound (OOB) bus 157 associated with a high speed interface (HSI) 141 that is configured to report status, exception and other data information to the channel controller 143 to exchange with the host 110.

As shown in FIG. 1B, the channel controller 143 can receive the status and exception information from a high speed interface (HSI) 141 associated with a bank arbiter 145 in each of the plurality of memory devices 120-1, . . . , 120-N. In the example of FIG. 1B, each of the plurality of memory devices 120-1, . . . , 120-N can include a bank arbiter 145 to sequence control and data with a plurality of banks, e.g., Bank zero (0), Bank one (1), . . . , Bank six (6), Bank seven (7), etc. Each of the plurality of banks, Bank 0, . . . , Bank 7, can include a controller 140-1, . . . , 140-7 (referred to generally as 140) and other components, including an array of memory cells 130 and sensing circuitry 150, logic circuitry 170, etc., as described in connection with FIG. 1A.

For example, each of the plurality of banks, e.g., Bank 0, . . . , Bank 7, in the plurality of memory devices 120-1, . . . , 120-N can include address circuitry 142 to latch address signals provided over a data bus 156 (e.g., an I/O bus) through I/O circuitry 144. Status and/or exception information can be provided from the controller 140 on the memory device 120 to the channel controller 143, using the OOB bus 157, which in turn can be provided from the plurality of memory devices 120-1, . . . , 120-N to the host 110. For each of the plurality of banks, e.g., Bank 0, . . . , Bank 7, address signals can be received through address circuitry 142 and decoded by a row decoder 146 and a column decoder 152 to access the memory array 130. Data can be read from memory array 130 by sensing voltage and/or current changes on the data lines using sensing circuitry 150. The sensing circuitry 150 can read and latch a page (e.g., row) of data from the memory array 130. The I/O circuitry 144 can be used for bi-directional data communication with host 110 over the data bus 156. The write circuitry 148 is used to write data to the memory array 130 and the 00B bus 157 can be used to report status, exception and other data information to the channel controller 143.

The channel controller 143 can include one or more local buffers 161 to receive program instructions and can include logic 160 to allocate a plurality of locations, e.g., subarrays or portions of subarrays, in the arrays of each respective bank to store program instructions, e.g., bank commands and arguments, (PIM commands) for the various banks associated with the operation of each of the plurality of memory devices 120-1, . . . , 120-N. The channel controller 143 can sends program instructions, e.g., PIM commands, to the plurality of memory devices 120-1, . . . , 120-N and store those program instructions within a given bank of a memory device 120-1, . . . , 120-N.

As described above in connection with FIG. 1A, the memory array 130 can be a DRAM array, SRAM array, STT RAM array, PCRAM array, TRAM array, RRAM array, NAND flash array, and/or NOR flash array, for instance. The array 130 can comprise memory cells arranged in rows coupled by access lines (which may be referred to herein as word lines or select lines) and columns coupled by sense lines, which may be referred to herein as data lines or digit lines.

As in FIG. 1A, a controller 140, e.g., bank control logic and/or sequencer, associated with a particular bank, Bank 0, . . . , Bank 7, in a given memory device, 120-1, . . . , 120-N, can decode signals provided by control bus 154 from the host 110. These signals can include chip enable signals, write enable signals, and address latch signals that are used to control operations performed on the memory array 130, including data read, data write, and data erase operations. In various embodiments, the controller 140 is responsible for executing program instructions from the host 110. And, as above, the controller 140 can include control logic, a sequencer, a state machine, etc., to control performing logical operations using the sensing circuitry, shown as 150 in FIG. 1A. For example, the controller 140 can control shifting data (e.g., right or left) in an array, e.g., memory array 130 in FIG. 1A.

FIG. 1C is a block diagram of a bank 121-1 to a memory device in accordance with a number of embodiments of the present disclosure. That is bank 121-1 can represent an example bank to a memory device such as Bank 0, . . . , Bank 7 (121-0, . . . , 121-7) shown in FIG. 1B. As shown in FIG. 1C, a bank architecture can include a plurality of main memory columns (shown horizontally as X), e.g., 16,384 columns in an example DRAM bank. Additionally, the bank 121-1 may be divided up into sections, 123-1, 123-2, . . . , 123-N, separated by amplification regions for a data path. Each of the of the bank sections 123-1, . . . , 123-N can include a plurality of rows (shown vertically as Y), e.g., each section may include 16,384 rows in an example DRAM bank. Example embodiments are not limited to the example horizontal and/or vertical orientation of columns and rows described here or the example numbers thereof.

As shown in FIG. 1C, the bank architecture can include sensing circuitry and additional logic circuitry 150/170, including sense amplifiers, registers, cache and data buffering, that is coupled to the bank sections 123-1, . . . , 123-N. The sensing circuitry and additional logic circuitry 150/170 can represent sensing circuitry 150 and additional logic circuitry associated with the array 130 shown in FIG. 1A and can provide and additional cache to cache 171 associated with the memory controller 140 in FIG. 1A. Further, as shown in FIG. 1C, the bank architecture can bank control 140 which can represent the memory controller 140 shown in FIG. 1A. The bank control shown in FIG. 1C can, in example, represent the functionality embodied by and contained in the memory controller 140 shown in FIG. 1A.

FIG. 1D is another block diagram of a bank 121 to a memory device in accordance with a number of embodiments of the present disclosure. For example, bank 121 can represent an example bank to a memory device such as Bank 0, . . . , Bank 7 (121-0, . . . , 121-7) shown in FIG. 1B. As shown in FIG. 1D, a bank architecture can include an address/control (A/C) path, e.g., bus, 153 coupled a memory controller, e.g., bank control/sequencer 140. Again, the bank control/sequencer 140 shown in FIG. 1D can, in example, represent at least a portion of the functionality embodied by and contained in the memory controller/sequencer 140 shown in FIGS. 1A and 1B. Also, as shown in FIG. 1D, a bank architecture can include a data path, e.g., bus, 155, coupled to a plurality of control/data registers in an instruction, e.g., program instructions (PIM commands), read path and coupled to a plurality of bank sections, e.g., bank section 123, in a particular bank 121.

As shown in FIG. 1D, a bank section 123 can be further subdivided into a plurality of sub-arrays (or subarrays) 125-1, 125-2, . . . , 125-N again separated by of plurality of sensing circuitry and additional logic circuitry 150/170 as shown in FIG. 1B and described further in connection with FIGS. 2-4. In one example, a bank section 121 may be divided into sixteen (16) subarrays. However, embodiments are not limited to this example number.

FIG. 1D, illustrates a program instruction cache 171 associated with the controller 140 to the bank and coupled to a write path 149 and coupled to each of the subarrays 125-1, . . . , 125-N in the bank 123. Alternatively or additionally, logic circuitry 170 shown in FIG. 1A may be used as an instruction cache, e.g., used to cache and/or re-cache retrieved instructions local (“on-pitch”) to a particular bank. In at least one embodiment, the plurality of subarrays 125-1, . . . , 125-N, and/or portions of the plurality of subarrays, may be referred to as a plurality of locations for storing program instructions, e.g., PIM commands, and/or constant data to a bank 123 in a memory device.

According to embodiments of the present disclosure, the controller 140, e.g. memory controller, shown in FIG. 1D is configured to receive a block of instructions and/or constant data from a host, e.g., host 110 in FIG. 1A. Alternatively, the block of instructions and/or constant data may be received at the controller 140 from a channel controller 143 either integrated with the host 110 or separate from the host, e.g., integrated in the form of a module 118 with a plurality of memory devices, 120-1, . . . , 120-N, as shown in FIG. 1B.

The block of instructions and/or data can include a plurality of program instructions, e.g. PIM commands, and/or constant data, e.g., data to set up for PIM calculations. According to embodiments, the memory controller 140 is configured to store the block of instructions and/or constant data from the host 110 and/or channel controller 143 in an array, e.g., array 130 shown in FIG. 1A and/or 123 shown in FIG. 1D, of a bank, e.g., banks 121-0, . . . , 121-7, shown in FIGS. 1B, 1C and 1D. The memory controller 140 is further configured, e.g. includes logic in the form of hardware circuitry and/or application specific integrated circuitry (ASIC), to receive program instructions and execute the program instructions to perform logical operations using the sensing circuitry, including a compute component, such as sensing circuitry shown as 150 in FIG. 1A and compute components 231 and 331 in FIGS. 2 and 3.

In the example embodiment of FIG. 1D, the controller 140 is configured to use DRAM protocol and DRAM logical and electrical interfaces to receive the program instructions and/or constant data from the host 110 and/or channel controller 143 and to execute the program instructions and/or use the constant data to perform logical operation with the compute component of sensing circuitry 150, 250 and/or 350. The program instructions and/or constant data received at and executed by the controller 140 can be pre-resolved, e.g., pre-defined, by a programmer and/or provided to the host 110 and/or channel controller 143.

In some embodiments, as seen in FIG. 1B, the array of memory cells (130 in FIG. 1A) includes a plurality of bank of memory cells 120-1, . . . , 120-N and the memory device 120 includes a bank arbiter 145 coupled to each of the plurality of banks 120-1, . . . , 120-N. In such embodiments, each bank arbiter is configured to receive a block of instructions and/or constant data relevant to a particular bank from the bank arbiter 145. The controller 140 can then store the received block of instructions and/or constant data to a plurality of locations for the particular bank as allocated by the host 110 and/or channel controller 143. For example, the host 110 and/or channel controller 143 is configured to address translate the plurality of locations for the bank arbiter 145 to assign to banks of the memory device 120. In at least one embodiment, as shown in FIG. 1D, the plurality of locations includes a number of subarrays 125-1, . . . , 125-N in the DRAM banks 121-1, . . . , 121-7 and/or portions of the number of subarrays.

According to embodiments, each memory controller 140 can be configured to receive instructions from the host 110 and/or channel controller 143, e.g., on A/C bus 154, to start execution of the block of instructions received to a given bank, 121-1, . . . , 121-7. The memory controller 140 is configured to retrieve instructions, e.g., on read data path 155 with control and data registers 151, from the plurality of locations for the particular bank and execute the program instructions to perform logical operations using the compute component of the sensing circuitry 150. The controller 140 can cache retrieved program instructions local to the particular bank, e.g. in instruction cache 171 and/or logic circuitry 170, to handle branches, loops, logical and data operations contained within the instructions block execution. And, the controller 140 can re-cache retrieved instructions for repeated use. Thus, the size of a dedicated program instruction memory (cache) on a DRAM device does not have to be increased to store pre-resolved program instructions on the PIM capable DRAM device (PIMRAM).

In some embodiments, a plurality of memory devices 120-1, . . . , 120-N are coupled to a host 110 and/or channel controller 143. Here, the host 110 and/or channel controller 143 can sends the block of instructions to an appropriate bank arbiter 145-1, . . . , 145-N for the plurality of memory devices, 120-1, . . . , 120-N, e.g., over a data bus 156.

Further, according to embodiments, the memory controller 140 is configured such that a bank 121 can receive a subsequent block of instruction of program instructions relevant to the particular bank and store instructions in the received block of instruction to a plurality of locations for the particular bank while, e.g., in parallel, the memory controller 140 is executing a previously received block of instructions. Hence, the embodiments described herein avoid needing to wait for future, or a next set of program instructions, e.g., PIM commands, to be received from a host 110 and/or channel controller 143. Instead, the apparatus and methods devices described herein facilitate a backing store in the PIM capable DRAM device for program instructions (e.g., PIM commands) and can facilitate pre-writing a subsequent block of instructions into allocated locations, while executing a previously received block of instructions, in order to facilitate the start of future calculations in the PIM capable DRAM device.

As the reader will appreciate, and as described in more detail in the examples of FIGS. 2-4, the memory controller 140 is configure to control the execution of program instructions, e.g., PIM commands, by controlling the sensing circuitry 150, including compute components 251 and/or 351, to implement logical functions such as AND, OR, NOT, NAND, NOR, and XOR logical functions. Additionally the memory controller 140 is configured to control the sensing circuitry 150 to perform non-Boolean logic operations, including copy, compare and erase operations, as part of executing program instructions, e.g., PIM commands.

FIG. 2 is a schematic diagram illustrating sensing circuitry 250 in accordance with a number of embodiments of the present disclosure. The sensing circuitry 250 can correspond to sensing circuitry 150 shown in FIGS. 1A and 1B. The sense amplifier 206 of sensing circuitry 250 can correspond to sense amplifiers 206 shown in FIG. 2, and the compute component 231 of sensing circuitry 250 can correspond to sensing circuitry, including compute component, 150 shown in FIG. 1A, for example.

A memory cell comprises a storage element (e.g., capacitor) and an access device (e.g., transistor). For instance, a first memory cell comprises transistor 202-1 and capacitor 203-1, and a second memory cell comprises transistor 202-2 and capacitor 203-2, etc. In this example, the memory array 230 is a DRAM array of 1T1C (one transistor one capacitor) memory cells. In a number of embodiments, the memory cells may be destructive read memory cells (e.g., reading the data stored in the cell destroys the data such that the data originally stored in the cell is refreshed after being read).

The cells of the memory array 230 can be arranged in rows coupled by word lines 204-X (Row X), 204-Y (Row Y), etc., and columns coupled by pairs of complementary sense lines (e.g., data lines DIGIT(n−1)/DIGIT(n−1)_, DIGIT(n)/DIGIT(n)_, DIGIT(n+1)/DIGIT(n+1)_). The individual sense lines corresponding to each pair of complementary sense lines can also be referred to as data lines 205-1 (D) and 205-2 (D_) respectively. Although only one pair of complementary data lines are shown in FIG. 2, embodiments of the present disclosure are not so limited, and an array of memory cells can include additional columns of memory cells and/or data lines (e.g., 4,096, 8,192, 16,384, etc.).

Memory cells can be coupled to different data lines and/or word lines. For example, a first source/drain region of a transistor 202-1 can be coupled to data line 205-1 (D), a second source/drain region of transistor 202-1 can be coupled to capacitor 203-1, and a gate of a transistor 202-1 can be coupled to word line 204-X. A first source/drain region of a transistor 202-2 can be coupled to data line 205-2 (D_), a second source/drain region of transistor 202-2 can be coupled to capacitor 203-2, and a gate of a transistor 202-2 can be coupled to word line 204-Y. The cell plate, as shown in FIG. 2, can be coupled to each of capacitors 203-1 and 203-2. The cell plate can be a common node to which a reference voltage (e.g., ground) can be applied in various memory array configurations.

The memory array 230 is coupled to sensing circuitry 250 in accordance with a number of embodiments of the present disclosure. In this example, the sensing circuitry 250 comprises a sense amplifier 206 and a compute component 231 corresponding to respective columns of memory cells (e.g., coupled to respective pairs of complementary data lines). The sense amplifier 206 can be coupled to the pair of complementary sense lines 205-1 and 205-2. The compute component 231 can be coupled to the sense amplifier 206 via pass gates 207-1 and 207-2. The gates of the pass gates 207-1 and 207-2 can be coupled to logical operation selection logic 213.

The logical operation selection logic 213 can be configured to include pass gate logic for controlling pass gates that couple the pair of complementary sense lines un-transposed between the sense amplifier 206 and the compute component 231 (as shown in FIG. 2) and/or swap gate logic for controlling swap gates that couple the pair of complementary sense lines transposed between the sense amplifier 206 and the compute component 231. The logical operation selection logic 213 can also be coupled to the pair of complementary sense lines 205-1 and 205-2. The logical operation selection logic 213 can be configured to control continuity of pass gates 207-1 and 207-2 based on a selected logical operation, as described in detail below for various configurations of the logical operation selection logic 413.

The sense amplifier 206 can be operated to determine a data value (e.g., logic state) stored in a selected memory cell. The sense amplifier 206 can comprise a cross coupled latch, which can be referred to herein as a primary latch. In the example illustrated in FIG. 2, the circuitry corresponding to sense amplifier 206 comprises a latch 215 including four transistors coupled to a pair of complementary data lines D 205-1 and D_205-2. However, embodiments are not limited to this example. The latch 215 can be a cross coupled latch (e.g., gates of a pair of transistors, such as n-channel transistors (e.g., NMOS transistors) 227-1 and 227-2 are cross coupled with the gates of another pair of transistors, such as p-channel transistors (e.g., PMOS transistors) 229-1 and 229-2). The cross coupled latch 215 comprising transistors 227-1, 227-2, 229-1, and 229-2 can be referred to as a primary latch.

In operation, when a memory cell is being sensed (e.g., read), the voltage on one of the data lines 205-1 (D) or 205-2 (D_) will be slightly greater than the voltage on the other one of data lines 205-1 (D) or 205-2 (D_). An ACT signal and the RNL* signal can be driven low to enable (e.g., fire) the sense amplifier 206. The data lines 205-1 (D) or 205-2 (D_) having the lower voltage will turn on one of the PMOS transistor 229-1 or 229-2 to a greater extent than the other of PMOS transistor 229-1 or 229-2, thereby driving high the data line 205-1 (D) or 205-2 (D_) having the higher voltage to a greater extent than the other data line 205-1 (D) or 205-2 (D_) is driven high.

Similarly, the data line 205-1 (D) or 205-2 (D_) having the higher voltage will turn on one of the NMOS transistor 227-1 or 227-2 to a greater extent than the other of the NMOS transistor 227-1 or 227-2, thereby driving low the data line 205-1 (D) or 205-2 (D_) having the lower voltage to a greater extent than the other data line 205-1 (D) or 205-2 (D_) is driven low. As a result, after a short delay, the data line 205-1 (D) or 205-2 (D_) having the slightly greater voltage is driven to the voltage of the supply voltage V_(CC) through source transistor 211, and the other data line 205-1 (D) or 205-2 (D_) is driven to the voltage of the reference voltage (e.g., ground) through the sink transistor 213. Therefore, the cross coupled NMOS transistors 227-1 and 227-2 and PMOS transistors 229-1 and 229-2 serve as a sense amplifier pair, which amplify the differential voltage on the data lines 205-1 (D) and 205-2 (D_) and operate to latch a data value sensed from the selected memory cell. As used herein, the cross coupled latch of sense amplifier 206 may be referred to as a primary latch 215. Embodiments are not limited to the sense amplifier 206 configuration illustrated in FIG. 2. As an example, the sense amplifier 206 can be current-mode sense amplifier and/or single-ended sense amplifier (e.g., sense amplifier coupled to one data line). Also, embodiments of the present disclosure are not limited to a folded data line architecture such as that shown in FIG. 2.

The sense amplifier 206 can, in conjunction with the compute component 231, be operated to perform various logical operations using data from an array as input. In a number of embodiments, the result of a logical operation can be stored back to the array without transferring the data via a data line address access (e.g., without firing a column decode signal such that data is transferred to circuitry external from the array and sensing circuitry via local I/O lines). As such, a number of embodiments of the present disclosure can enable performing logical operations and compute functions associated therewith using less power than various previous approaches. Additionally, since a number of embodiments eliminate the need to transfer data across I/O lines in order to perform compute functions (e.g., between memory and discrete processor), a number of embodiments can enable an increased parallel processing capability as compared to previous approaches.

The sense amplifier 206 can further include equilibration circuitry 214, which can be configured to equilibrate the data lines 205-1 (D) and 205-2 (D_). In this example, the equilibration circuitry 214 comprises a transistor 224 coupled between data lines 205-1 (D) and 205-2 (D_). The equilibration circuitry 214 also comprises transistors 225-1 and 225-2 each having a first source/drain region coupled to an equilibration voltage (e.g., V_(DD)/2), where V_(DD) is a supply voltage associated with the array. A second source/drain region of transistor 225-1 can be coupled data line 205-1 (D), and a second source/drain region of transistor 225-2 can be coupled data line 205-2 (D_). Gates of transistors 224, 225-1, and 225-2 can be coupled together, and to an equilibration (EQ) control signal line 226. As such, activating EQ enables the transistors 224, 225-1, and 225-2, which effectively shorts data lines 205-1 (D) and 205-2 (D_) together and to the an equilibration voltage (e.g., V_(CC)/2).

Although FIG. 2 shows sense amplifier 206 comprising the equilibration circuitry 214, embodiments are not so limited, and the equilibration circuitry 214 may be implemented discretely from the sense amplifier 206, implemented in a different configuration than that shown in FIG. 2, or not implemented at all.

As described further below, in a number of embodiments, the sensing circuitry (e.g., sense amplifier 206 and compute component 231) can be operated to perform a selected logical operation and initially store the result in one of the sense amplifier 206 or the compute component 231 without transferring data from the sensing circuitry via an I/O line (e.g., without performing a data line address access via activation of a column decode signal, for instance).

Performance of logical operations (e.g., Boolean logical functions involving data values) is fundamental and commonly used. Boolean logic functions are used in many higher level functions. Consequently, speed and/or power efficiencies that can be realized with improved logical operations, can translate into speed and/or power efficiencies of higher order functionalities.

As shown in FIG. 2, the compute component 231 can also comprise a latch, which can be referred to herein as a secondary latch 264. The secondary latch 264 can be configured and operated in a manner similar to that described above with respect to the primary latch 215, with the exception that the pair of cross coupled p-channel transistors (e.g., PMOS transistors) comprising the secondary latch can have their respective sources coupled to a supply voltage (e.g., V_(DD)), and the pair of cross coupled n-channel transistors (e.g., NMOS transistors) of the secondary latch can have their respective sources selectively coupled to a reference voltage (e.g., ground), such that the secondary latch is continuously enabled. The configuration of the compute component is not limited to that shown in FIG. 2 at 231, and various other embodiments are described further below.

FIG. 3 is a schematic diagram illustrating sensing circuitry capable of implementing an XOR logical operation in accordance with a number of embodiments of the present disclosure. FIG. 3 shows a sense amplifier 306 coupled to a pair of complementary sense lines 305-1 and 305-2, and a compute component 331 coupled to the sense amplifier 306 via pass gates 307-1 and 307-2. The sense amplifier 306 shown in FIG. 3 can correspond to sense amplifier 206 shown in FIG. 2. The compute component 331 shown in FIG. 3 can correspond to sensing circuitry, including compute component, 150 shown in FIG. 1A, for example. The logical operation selection logic 313 shown in FIG. 3 can correspond to logical operation selection logic 413 shown in FIG. 4, for example.

The gates of the pass gates 307-1 and 307-2 can be controlled by a logical operation selection logic signal, Pass. For example, an output of the logical operation selection logic can be coupled to the gates of the pass gates 307-1 and 307-2. The compute component 331 can comprise a loadable shift register configured to shift data values left and right.

According to the embodiment illustrated in FIG. 3, the compute components 331 can comprise respective stages (e.g., shift cells) of a loadable shift register configured to shift data values left and right. For example, as illustrated in FIG. 3, each compute component 331 (e.g., stage) of the shift register comprises a pair of right-shift transistors 381 and 386, a pair of left-shift transistors 389 and 390, and a pair of inverters 387 and 388. The signals PHASE 1R, PHASE 2R, PHASE 1L, and PHASE 2L can be applied to respective control lines 382, 383, 391 and 392 to enable/disable feedback on the latches of the corresponding compute components 331 in association with performing logical operations and/or shifting data in accordance with embodiments described herein.

The sensing circuitry shown in FIG. 3 also shows a logical operation selection logic 313 coupled to a number of logic selection control input control lines, including ISO, TF, TT, FT, and FF. Selection of a logical operation from a plurality of logical operations is determined from the condition of logic selection control signals on the logic selection control input control lines, as well as the data values present on the pair of complementary sense lines 305-1 and 305-2 when the isolation transistors are enabled via the ISO control signal being asserted.

According to various embodiments, the logical operation selection logic 313 can include four logic selection transistors: logic selection transistor 362 coupled between the gates of the swap transistors 342 and a TF signal control line, logic selection transistor 352 coupled between the gates of the pass gates 307-1 and 307-2 and a TT signal control line, logic selection transistor 354 coupled between the gates of the pass gates 307-1 and 307-2 and a FT signal control line, and logic selection transistor 364 coupled between the gates of the swap transistors 342 and a FF signal control line. Gates of logic selection transistors 362 and 352 are coupled to the true sense line through isolation transistor 350-1 (having a gate coupled to an ISO signal control line). Gates of logic selection transistors 364 and 354 are coupled to the complementary sense line through isolation transistor 350-2 (also having a gate coupled to an ISO signal control line).

Data values present on the pair of complementary sense lines 305-1 and 305-2 can be loaded into the compute component 331 via the pass gates 307-1 and 307-2. The compute component 331 can comprise a loadable shift register. When the pass gates 307-1 and 307-2 are OPEN, data values on the pair of complementary sense lines 305-1 and 305-2 are passed to the compute component 331 and thereby loaded into the loadable shift register. The data values on the pair of complementary sense lines 305-1 and 305-2 can be the data value stored in the sense amplifier 306 when the sense amplifier is fired. The logical operation selection logic signal, Pass, is high to OPEN the pass gates 307-1 and 307-2.

The ISO, TF, TT, FT, and FF control signals can operate to select a logical function to implement based on the data value (“B”) in the sense amplifier 306 and the data value (“A”) in the compute component 331. In particular, the ISO, TF, TT, FT, and FF control signals are configured to select the logical function to implement independent from the data value present on the pair of complementary sense lines 305-1 and 305-2 (although the result of the implemented logical operation can be dependent on the data value present on the pair of complementary sense lines 305-1 and 305-2. For example, the ISO, TF, TT, FT, and FF control signals select the logical operation to implement directly since the data value present on the pair of complementary sense lines 305-1 and 305-2 is not passed through logic to operate the gates of the pass gates 307-1 and 307-2.

Additionally, FIG. 3 shows swap transistors 342 configured to swap the orientation of the pair of complementary sense lines 305-1 and 305-2 between the sense amplifier 313-7 and the compute component 331. When the swap transistors 342 are OPEN, data values on the pair of complementary sense lines 305-1 and 305-2 on the sense amplifier 306 side of the swap transistors 342 are oppositely-coupled to the pair of complementary sense lines 305-1 and 305-2 on the compute component 331 side of the swap transistors 342, and thereby loaded into the loadable shift register of the compute component 331.

The logical operation selection logic signal Pass can be activated (e.g., high) to OPEN the pass gates 307-1 and 307-2 (e.g., conducting) when the ISO control signal line is activated and either the TT control signal is activated (e.g., high) with data value on the true sense line is “1” or the FT control signal is activated (e.g., high) with the data value on the complement sense line is “1.”

The data value on the true sense line being a “1” OPENs logic selection transistors 352 and 362. The data value on the complimentary sense line being a “1” OPENs logic selection transistors 354 and 364. If the ISO control signal or either the respective TT/FT control signal or the data value on the corresponding sense line (e.g., sense line to which the gate of the particular logic selection transistor is coupled) is not high, then the pass gates 307-1 and 307-2 will not be OPENed by a particular logic selection transistor.

The logical operation selection logic signal PassF can be activated (e.g., high) to OPEN the swap transistors 342 (e.g., conducting) when the ISO control signal line is activated and either the TF control signal is activated (e.g., high) with data value on the true sense line is “1,” or the FF control signal is activated (e.g., high) with the data value on the complement sense line is “1.” If either the respective control signal or the data value on the corresponding sense line (e.g., sense line to which the gate of the particular logic selection transistor is coupled) is not high, then the swap transistors 342 will not be OPENed by a particular logic selection transistor.

The Pass* control signal is not necessarily complementary to the Pass control signal. It is possible for the Pass and Pass* control signals to both be activated or both be deactivated at the same time. However, activation of both the Pass and Pass* control signals at the same time shorts the pair of complementary sense lines together, which may be a disruptive configuration to be avoided.

The sensing circuitry illustrated in FIG. 3 is configured to select one of a plurality of logical operations to implement directly from the four logic selection control signals (e.g., logical operation selection is not dependent on the data value present on the pair of complementary sense lines). Some combinations of the logic selection control signals can cause both the pass gates 307-1 and 307-2 and swap transistors 342 to be OPEN at the same time, which shorts the pair of complementary sense lines 305-1 and 305-2 together. According to a number of embodiments of the present disclosure, the logical operations which can be implemented by the sensing circuitry illustrated in FIG. 3 can be the logical operations summarized in the logic tables shown in FIG. 4.

FIG. 4 is a logic table illustrating selectable logic operation results implemented by a sensing circuitry shown in FIG. 3 in accordance with a number of embodiments of the present disclosure. The four logic selection control signals (e.g., TF, TT, FT, and FF), in conjunction with a particular data value present on the complementary sense lines, can be used to select one of plural logical operations to implement involving the starting data values stored in the sense amplifier 306 and compute component 331. The four control signals, in conjunction with a particular data value present on the complementary sense lines, controls the continuity of the pass gates 307-1 and 307-2 and swap transistors 342, which in turn affects the data value in the compute component 331 and/or sense amplifier 306 before/after firing. The capability to selectably control continuity of the swap transistors 342 facilitates implementing logical operations involving inverse data values (e.g., inverse operands and/or inverse result), among others.

Logic Table 4-1 illustrated in FIG. 4 shows the starting data value stored in the compute component 331 shown in column A at 444, and the starting data value stored in the sense amplifier 306 shown in column B at 445. The other 3 column headings in Logic Table 4-1 refer to the continuity of the pass gates 307-1 and 307-2, and the swap transistors 342, which can respectively be controlled to be OPEN or CLOSED depending on the state of the four logic selection control signals (e.g., TF, TT, FT, and FF), in conjunction with a particular data value present on the pair of complementary sense lines 305-1 and 305-2. The “Not Open” column corresponds to the pass gates 307-1 and 307-2 and the swap transistors 342 both being in a non-conducting condition, the “Open True” corresponds to the pass gates 307-1 and 307-2 being in a conducting condition, and the “Open Invert” corresponds to the swap transistors 342 being in a conducting condition. The configuration corresponding to the pass gates 307-1 and 307-2 and the swap transistors 342 both being in a conducting condition is not reflected in Logic Table 4-1 since this results in the sense lines being shorted together.

Via selective control of the continuity of the pass gates 307-1 and 307-2 and the swap transistors 342, each of the three columns of the upper portion of Logic Table 4-1 can be combined with each of the three columns of the lower portion of Logic Table 4-1 to provide 3×3=9 different result combinations, corresponding to nine different logical operations, as indicated by the various connecting paths shown at 475. The nine different selectable logical operations that can be implemented by the sensing circuitry 150 as shown in FIG. 1 are summarized in Logic Table 4-2 illustrated in FIG. 4, including an XOR logical operation.

The columns of Logic Table 4-2 illustrated in FIG. 4 show a heading 480 that includes the state of logic selection control signals. For example, the state of a first logic selection control signal is provided in row 476, the state of a second logic selection control signal is provided in row 477, the state of a third logic selection control signal is provided in row 478, and the state of a fourth logic selection control signal is provided in row 479. The particular logical operation corresponding to the results is summarized in row 447.

While example embodiments including various combinations and configurations of sensing circuitry, sense amplifiers, compute component, dynamic latches, isolation devices, and/or shift circuitry have been illustrated and described herein, embodiments of the present disclosure are not limited to those combinations explicitly recited herein. Other combinations and configurations of the sensing circuitry, sense amplifiers, compute component, dynamic latches, isolation devices, and/or shift circuitry disclosed herein are expressly included within the scope of this disclosure.

Although specific embodiments have been illustrated and described herein, those of ordinary skill in the art will appreciate that an arrangement calculated to achieve the same results can be substituted for the specific embodiments shown. This disclosure is intended to cover adaptations or variations of one or more embodiments of the present disclosure. It is to be understood that the above description has been made in an illustrative fashion, and not a restrictive one. Combination of the above embodiments, and other embodiments not specifically described herein will be apparent to those of skill in the art upon reviewing the above description. The scope of the one or more embodiments of the present disclosure includes other applications in which the above structures and methods are used. Therefore, the scope of one or more embodiments of the present disclosure should be determined with reference to the appended claims, along with the full range of equivalents to which such claims are entitled.

In the foregoing Detailed Description, some features are grouped together in a single embodiment for the purpose of streamlining the disclosure. This method of disclosure is not to be interpreted as reflecting an intention that the disclosed embodiments of the present disclosure have to use more features than are expressly recited in each claim. Rather, as the following claims reflect, inventive subject matter lies in less than all features of a single disclosed embodiment. Thus, the following claims are hereby incorporated into the Detailed Description, with each claim standing on its own as a separate embodiment. 

What is claimed is:
 1. An apparatus, comprising: a memory device, comprising: a plurality of banks having an array of memory cells; sensing circuitry coupled to a back end of each bank among the plurality of banks and configured to perform logical operations; and a bank controller on each bank and coupled to the sensing circuitry for the plurality of banks, the bank controller configured to: receive a block of instructions and store the block of instructions local to the bank among the plurality of banks, wherein the block of instructions comprises a plurality of program instructions; retrieve individual program instructions for repeated use to handle logical operations contained within the block of instructions using the sensing circuitry on the bank; cache retrieved program instructions local on the bank and in association with the array of memory cells where the program instructions were retrieved and used by the sensing circuitry; and re-cache retrieved program instructions local on the bank for repeated use.
 2. The apparatus of claim 1, wherein the bank controller is further configured to store the block of instructions to an allocated location in the array of memory cells.
 3. The apparatus of claim 2, wherein the array of memory cells are dynamic random access memory (DRAM) cells and the controller is configured to use a DRAM protocol and DRAM logic and electrical interfaces to execute the program instructions to perform logical operations on a compute component coupled to the sensing circuitry.
 4. The apparatus of claim 2, wherein the allocated locations in the plurality of banks are portions of a plurality of sub-arrays.
 5. The apparatus of claim 1, wherein the block of instructions received by the controller are pre-resolved by a host.
 6. The apparatus of claim 1, wherein the plurality of program instructions comprise a plurality of program instructions associated with processing in memory (PIM) commands.
 7. The apparatus of claim 1, wherein the memory device further includes logic circuitry coupled to the sensing circuitry, the logic circuitry including latches in the form of sense amplifiers and wherein the controller is configured to cache and re-cache retrieved program instructions to the logic circuitry.
 8. The apparatus of claim 1, wherein the apparatus further comprises: a plurality of memory devices; a bank arbiter associated with each of the plurality of memory devices; and a channel controller coupled to the bank arbiter and the plurality of memory devices, wherein the channel controller sends a block of program instructions to an appropriate bank arbiter among the plurality of memory devices.
 9. The apparatus of claim 1, wherein the bank controller is configured to control the sensing circuitry to perform non-Boolean logic operations including copy, compare, and erase.
 10. The apparatus of claim 1, wherein the bank controller is configured to control the sensing circuitry to implement logical functions including AND, OR, NOT, XOR, NAND and NOR logical functions.
 11. A method of operating a memory device, comprising: receiving a first block of program instructions; writing the first block of program instructions to one of a plurality of allocated locations within an array of memory cells; executing, via a bank controller, the first block of program instructions by retrieving the first block of program instructions local to the bank controller from the one of the plurality of allocated locations within the array to perform logical operations in sensing circuitry coupled to a back end of the array; caching the first block of instructions local to the bank controller in association with the array where the first block of program instructions are retrieved and used by the sensing circuitry; re-caching the first block of instructions local to the bank controller for repeated use to handle logical operations; and simultaneously writing a subsequent block of program instructions into one of the plurality of allocated locations to facilitate the start of future operations while the bank controller is executing the first block of program instructions.
 12. The method of claim 11 wherein the allocated location is a sub-array of memory cells within a bank.
 13. The method of claim 11 wherein receiving the first block of program instructions and the subsequent block of program instructions from a host are pre-resolved program instructions associated with processing in memory (PIM) commands.
 14. The method of claim 11 wherein caching and re-caching the first block of program instructions and the subsequent block of program instructions to the allocated locations comprises caching and re-caching in additional logic circuitry coupled to the sensing circuitry.
 15. A system, comprising: a host; a memory device coupled to the host, wherein the memory device is configured to: receive a block of pre-resolved program instructions from the host, the block of pre-resolved program instructions includes a plurality of program instructions relevant to a particular bank of a plurality of banks; store the program instructions in an array of memory cells to an allocated location in the bank determined by the host; retrieve the program instructions from the allocated location and execute an individual program instruction of the plurality of program instructions to perform logical operations in sensing circuitry located at a back end of each bank among the array of memory cells; cache the retrieved individual program instruction local to the particular bank of the plurality of banks where the retrieved individual program instruction are retrieved and used by the sensing circuitry; re-cache the retrieved individual program instructions local on the particular bank for repeated use; and retrieve individual program instructions to perform logical operations in a compute component.
 16. The system of claim 15, wherein the system further comprises a bank arbiter and a plurality of memory devices configured to couple to the host and/or a channel controller, wherein the host and/or channel controller is configured to send the block of program instructions to the bank arbiter for each of the plurality of memory devices.
 17. The system of claim 16, wherein the system simultaneously stores another block of pre-resolved program instructions into a location allocated by the host and/or channel controller to facilitate the start of future operations while the controller is executing a previous block of program instructions.
 18. The system of claim 15, wherein the allocated location in the bank is a portion of a plurality of sub-arrays.
 19. The system of claim 15, wherein the array of memory cells are dynamic random access memory (DRAM) cells and wherein the host provides a large block of instructions to the array of memory cells at the beginning of an operation. 